Heat-generator.



Patented Dec. I7, |901.

M. W., J. P. & E. J. GRACE.

HEAT GENERATOR. (Application filled Aug. 14. 1901.)

(No Model.)

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NTTE STATES `PATENT OEETCE.

MICHAEL W. GRACE, JOI-IN P. GRACE, AND EDVARD J. GRACE, OF

CHICAGO, ILLINOIS. I

HEAT-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 688,846, dated December 17, 1901. Application iled August 14,1901. Serial No. 72,028. (No model.)

To @ZZ whom t may concern.-

Beit known that we, MICHAEL W. GRACE, JOHN P. GRACE, and EDWARD J. GRACE, citi'- zens of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Heat-Generators, of which the following is a specification.

Our invention relates to lheat-geneuators wherein coal or other fuel is burned to produce heat; and the object of our invention is to prevent the discharge of smoke and to render possible the advantageous use of 10W- grade bituminous coals. We attain this object by the device shown in the accompanying drawings, in which- Figure l is a plan view in section, taken on the line l l, Fig. 2; and Fig. 2 is a sectional elevation on the line 2 2, Fig. l.

Similar letters referto similar parts throughout both views.

Our invention is shown embodied in a boilersetting, in which a represents the front wall, b the back wall, and c and d the end walls, of the setting. The boiler e, which for illustration is here shown of the horizontal fire-tube pattern, is suitably supported upon the walls of the setting. At a point adjacent to the end wall c is located a grate f, which extends from the front wall a, rearwardly toward the wall b, preferably a distance somewhat more than one-half the distance between said front and rear walls a and o. The wall g, which extends from the iloor 71. of the setting upward to the boiler e, is located at the edge of the grate f remote from the end wall c. Said wall g does not extend completely to the rear wall b, but does extend, preferably, beyond the rear extremity of said grate, thereby forming a chamber 't' behind the fire-box of the setting.

j represents a second wall parallel to the Wall g and at a distance therefrom approximately equal to the width of the grate f. Said wall extends from the floor h to the boiler e and from the back wall b forward to a point somewhat in front of the center line of the boiler. In addition to the part mentioned the wallj has a portion 7o extending to the front wall a, but rising only a slight distance above the iioor h sufficient to reach and form a support for the lower burner m of the retort. Said retort is formed between said burner m and a similar burner n, located above the former and lying between the vertical walls j and o. The wall o reaches from the door 72. upward to the boiler and extends from the front wall a to a point somewhat to the rear of the center line of the boiler. and o are so placed that the chamber 1J is formed to the rear of said retort for receiving and completing the combustion of the fuelgases. The burners m and n, above referred to, lie substantially horizon tally between said wallsj and o and in the present instance are in the form of grates for burning smokeless coal, coke, or charcoal, although burners adapted for any other kind of fuel may be substituted therefor with the same result. By preference the said burners fm. and ot are respectively below and above the level of the grate f in order to facilitate the passage of the gases from said gratefbetween the burners m and n in the manner presently to be described.

The vertical baiiie-walls r and s rise from the licor h to the boiler e, the wall r being nearer the Wall 0 and extending forwardly from the rear wall o, while the wall s extends rearwardly from the front wall a. The boiler e reaches from the end wall c to said wall s, leaving the space between said wall s and the end wall CZ as an uptake through which the gases pass into the boiler-tubes t. In the presentsetting the gases first pass only into the lower tubes of the boiler, being deflected thereinto by the cover-plate u, which forms a connection between the boiler and the end wall d. `At the opposite end of the boiler the uptake e again deliects the gases into the upper boiler-tubes to return them through the boiler and into the flue w on their way to the chimney.

It will of course be understood that suitable ire-doors, ash-pit doors, ventilators, and other accessories are provided iu the usual manner.

In Fig. l, ff represent doors inthe front Wall ct for inserting fuel onto the grate f, while n' is a door, also in said front wall, for gaining access to the burners m and n.

In operation fires are started in both of the Said walls 7' IOO burners m and fa, using quick-burning and non-smoking fuel, and after a draft has been started in the fines a fire is started in the main gratef, using a poorer grade of bituminous coal or other cheap fuel, which ordinarily generates smoke in considerable quantity. The gases and smoke coming from the grate fare drawn around the rear edge of the wall g and then forward into the space between the burners m and fn. By the time the gases have reached the retort formed by said burners they are thoroughly mixed and in passing over the lower burner m and upward through the upper burner n, are raised to a high temperature, due to the high temperatures of said burners, and the combustion of the gases is thereby rendered complete and thorough. Said gases thence pass around the vwalls o, r, ands and finally enter the boilerflues for further heating the boiler.

By the use of this device it is possible to utilize low-grade coal to good advantage in the grate f, and thereby both eeonomize in the cost of fuel and prevent the escape of any considerable amount of smoke.

What we claim as new, and desire to secure by Letters Patent, is-

l. In a heat-generator, the combination of a grate for burning low-grade fuel, a wall adjacent to said grate for guiding the gases in a rearward direction, a second and a third wall parallel to said first wall, and two secondary burners located between said second and third walls, said second wall having an opening therein connecting with the space between said secondary burners for guiding the gases of combustion over said burners.

2. In a heat-generator, the combination of exterior walls, a grate for burning low-grade fuel, an inner wall adjacent to said grate, and

extending from the front exterior'wall rear wardly beyond said grate, a plurality of secondary burners for high-grade fuel, a second and a third wall approximately parallel to said iirst inner wall, said second and third walls being located adjacent to said secondary burners, said second wall having an opening communicating with the space between said burners, said second inner wall extending forwardly from the rear exteriorwall, and said third inner wall extending rearwardly from the front exterior wall, substantially as described. 3. In a heat-generator, the combination of exterior walls, a grate for burning low-grade fuel, an inner wall adjacent to said grate, and extending from the front exterior wall rearwardly beyond said grate, a plurality of secondary burners for high-grade fuel, a second and a third wall approximately parallel to said first inner wall, said second and third walls being located adjacent to said secondary burners, 'said second wall having an opening communicating with the space between said burners said second inner wall extending forwardly from the rear exterior wall, and said third inner wall extending rearwardly from the front exterior wall, and openings at different points in said front exterior wall for gaining access to said grate and to said secondary burners, whereby the same may be operated from the same side of the generator substantially in the manner and for the purpose set forth.

MICHAEL W. GRACE.

JOHN P., GRACE.

EDWARD J. GRACE.

Witnesses:

DAGMAR OsTERMANN, ARTHUR M. Cox. 

